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The Honeywell FW-23-13 is a specialized flame safeguard controller designed for industrial combustion systems, serving as a critical safety component in burner management systems (BMS) that comply with NFPA 85 (boilers) and NFPA 86 (ovens and furnaces). Engineered for reliability in demanding thermal applications, the Honeywell FW-23-13 continuously monitors the presence of flame via input from compatible ultraviolet (UV) or infrared (IR) flame scanners, ensuring that fuel valves remain energized only when a valid flame is confirmed. In the event of flame loss, ignition failure, or internal fault, the Honeywell FW-23-13 immediately de-energizes its safety relay outputs, triggering a safe shutdown to prevent unburned fuel accumulation and potential explosion hazards.
Built around a robust microprocessor platform, the Honeywell FW-23-13 offers advanced self-diagnostics, programmable timing sequences (pre-purge, ignition trial, post-purge), and visual status indication through front-panel LEDs. Its compact DIN-rail mountable design allows easy integration into control panels for boilers, thermal oxidizers, process heaters, and drying ovens across power generation, chemical processing, and manufacturing sectors. With approvals including UL 353 and CSA, the Honeywell FW-23-13 delivers code-compliant performance while simplifying maintenance through clear fault reporting and modular replacement.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | FW-23-13 |
| Manufacturer | Honeywell Thermal Solutions (formerly Honeywell Combustion Safety) |
| Product Type | Flame Safeguard Controller / Burner Management Relay |
| Flame Sensor Input | Compatible with UV (e.g., C7061A) or IR (e.g., C7062A) flame rods/scanners |
| Power Supply | 120 VAC ±10%, 50/60 Hz (other voltage variants available) |
| Safety Relay Outputs | 2 SPDT (Form C) relays, rated 5 A @ 240 VAC resistive |
| Operating Temperature | -20°C to +60°C (-4°F to +140°F) |
| Enclosure Rating | Open-style (intended for panel mounting in NEMA 1/12 enclosure) |
| Approvals | UL 353, CSA C22.2 No. 353, NFPA 85/86 compliant |
| Mounting | 35 mm DIN rail (per EN 50022) |
| Diagnostics | LED indicators for Power, Flame On, Fault, and Relay Status |
Main Features and Advantages
Fail-safe combustion safety with rapid response: The Honeywell FW-23-13 features a < 4>
Advanced self-diagnostics and troubleshooting: Unlike basic electromechanical relays, the Honeywell FW-23-13 continuously checks its own circuitry, flame input signal quality, and relay integrity. If a fault is detected (e.g., shorted scanner wiring, relay weld, or power anomaly), a dedicated “Fault” LED illuminates, and the safety outputs drop out—providing both protection and clear maintenance direction without requiring external test equipment.
Flexible timing configuration: While factory-set for standard sequences, the Honeywell FW-23-13 supports field adjustments for ignition trial duration (typically 10–90 seconds) and pre-purge timing via internal DIP switches or potentiometers (depending on revision), allowing adaptation to specific burner geometries and fuel types—natural gas, propane, or light oil.
Proven reliability in harsh conditions: Designed for continuous duty in high-temperature plant areas, the Honeywell FW-23-13 uses industrial-grade components with wide tolerance margins. Its immunity to electrical noise ensures stable operation near VFDs, arc welders, or high-energy ignition transformers—common challenges in metal processing and petrochemical facilities.
Application Field
The Honeywell FW-23-13 is widely deployed in industrial heating systems where combustion safety is paramount. In utility and industrial boilers, it safeguards water-tube and fire-tube units by verifying main flame presence during startup and operation. In refineries, it controls fired heaters used for crude preheating or catalytic regeneration, interfacing with complex fuel trains and purge dampers.
Thermal oxidizers in paint booths, printing lines, and chemical plants rely on the Honeywell FW-23-13 to ensure complete destruction of VOCs while preventing flashback or puffing events. Similarly, in food processing and textile drying ovens governed by NFPA 86, the module enforces safe ignition sequences and continuous flame supervision—even under variable airflow or load conditions. Its role extends to emergency backup systems in hospitals and campuses, where boiler reliability directly impacts facility resilience.
Related Products
C7061A1062: UV Flame Scanner – commonly paired with FW-23-13
C7062A1024: IR Flame Detector – alternative for dirty or high-background-light environments
S8610U: Universal Burner Control – higher-end successor with Modbus communication
R7284U: Integrated flame safeguard with display – modern replacement option
Q7070A: Ignition transformer interface module – often used in same BMS panel
NFPA 85/86 Compliance Kits: Documentation and interlock templates for FW-23-13 installations
DIN Rail Enclosure (NEMA 12): Protective housing for FW-23-13 in industrial settings
Installation and Maintenance
Pre-installation preparation: Before installing the Honeywell FW-23-13, verify compatibility with your flame scanner model and confirm correct wiring per the terminal diagram (flame signal, power, and safety output circuits). Ensure the unit is mounted in a clean, dry panel away from direct heat sources (>60°C ambient may degrade performance). Ground the DIN rail and enclosure per NEC Article 250.
Maintenance recommendations: Perform monthly functional tests by simulating flame failure (e.g., blocking scanner view) to confirm safety relay dropout and alarm activation. Inspect wiring terminals for looseness or corrosion, especially in humid coastal plants. Clean the flame scanner lens regularly—dirty optics are a common cause of false “no flame” trips misattributed to the FW-23-13. Replace the unit every 7–10 years as part of preventive safety lifecycle management.
